Year	2017 PPP (%)
1989	30.7
1991	35.3
1995	27.3
1996	28.6
1998	31.6
1999	28.6
2000	24.2
2001	25.5
2002	25.8
2003	26.8
2004	23.6
2005	23.3
2006	20.5
2007	17.9
2008	20.9
2009	20.6
2010	19.6
2011	19
2012	17.5
2013	15.6
2014	15.3
2015	13.5
2016	13.4
2017	12
2018	10.8
2019	8.8
2021	10.1
2022	9.9